Table 1. Baseline Patient Characteristics.
| Variable | Number (%) |
| Median age | 63 (range 54–83) |
| 50–69 | 16 (64%) |
| ≥70 | 9 (36%) |
| Sex | |
| Male | 18 (72%) |
| Female | 7 (28%) |
| ECOG performance status | |
| 0 | 4 (16%) |
| 1 | 13 (52%) |
| 2 | 8 (32%) |
| Previous chemotherapy | |
| No | 12 (48%) |
| Yes | 13 (52%) |
| Prior RT | |
| No | 15 (60%) |
| Yes | 10 (40%) |
| Number of metastases | |
| 1 | 13 (52%) |
| 2 | 5 (20%) |
| ≥3 | 7 (28%) |
| Largest tumor size | |
| ≤3 cm | 15 (60%) |
| >3 cm | 10 (40%) |
| Number of involved organs | |
| 1 | 20 (80%) |
| ≥ 2 | 5 (20%) |
| Treatment site | 49 total tumors |
| Bone | 21 (43%) |
| Lung | 14 (29%) |
| Lymph node | 8 (16%) |
| Visceral (adrenal, thyroid, inferior vena cava, chest wall) | 6 (12%) |
| Tumor type | |
| Head and neck squamous cell carcinoma | 4 (16%) |
| Hepatocellular carcinoma | 4 (16%) |
| Non-small cell lung carcinoma | 4 (16%) |
| Renal cell carcinoma | 4 (16%) |
| Prostate adenocarcinoma | 2 (8%) |
| Colorectal adenocarcinoma | 2 (8%) |
| Pancreatic adenocarcinoma | 1 (4%) |
| Melanoma | 1 (4%) |
| Other (sarcoma, breast, skin squamous cell, parotid, thyroid, small cell lung) | 3 (12%) |